Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f22f526b0d70827…

MALICIOUS

PDF

46.0 KB Created: 2020-07-18 01:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bce96301ae684116702ea962f48d472 SHA-1: 7261674d1e3f73ca0ec3af82dbecf6094ded05aa SHA-256: 5f22f526b0d70827a1407af25aa0df731dbaf9b75684efb8b49db18c15dbc99a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of the initial links directs to known malicious redirector infrastructure. This suggests the PDF is part of a link farm or SEO poisoning scheme designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wb?keyword=que%20son%20las%20lipoproteinas%20pdf
    • http://files.support.famhealth.com/uploads/1/3/1/4/131437740/3357936.pdf
    • http://files.movetherapies.com/uploads/1/3/1/1/131164387/runemo.pdf
    • http://files.alanbirtwistle.com/uploads/1/3/1/3/131383664/werox_xapedewero_bemidituziv_zurer.pdf
    • http://files.myfaithfulcatholicjourney.com/uploads/1/3/1/3/131382395/ede490.pdf
    • http://files.leataire.com/uploads/1/3/0/7/130775607/b3708f0de81a6.pdf
    • http://files.mirrorimagedanceteam.com/uploads/1/3/1/8/131871994/3940577.pdf
    • http://files.kaitiakirestoration.co.nz/uploads/1/3/1/4/131455956/sulabebo_xeloxopufuto_tajunoperedo.pdf
    • http://files.bullengarookadultriders.com/uploads/1/3/2/6/132681596/fomapofegaro-wopigadazodup-zevevamer-tirexilagenizo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://nokebabu.files.wordpress.com/2020/07/vofugete.pdf
    • https://rudukaleditu308957543.files.wordpress.com/2020/06/nafusutejarevukibaped.pdf
    • https://pigumofow.files.wordpress.com/2020/07/wiredagixefajeso.pdf
    • https://kudivex.files.wordpress.com/2020/07/mejugasil.pdf
    • https://giwukebax.files.wordpress.com/2020/07/gomaxubolubenefubutafi.pdf
    • https://cdn.shopify.com/s/files/1/0428/6719/6063/files/45420738550.pdf
    • https://cdn.shopify.com/s/files/1/0430/0396/9689/files/zoxosepadafinirofapa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8262/8766/files/1907878632.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92399027362.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7924/files/64028359551.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/14811773342.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/93883503473.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38967404473.pdf
    • https://cdn.shopify.com/s/files/1/0431/3507/4465/files/65141289695.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/66299306651.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075cd.bin
eae7d7ac39d0bbbb8f61ff5aa14c5ffa7d5678ea69cb4d860de7014f10d6a1a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75CD 4980 bytes
font_01_sfnt_off000086c0.bin
cf40195b7c83c8650f16127a8e6ce8519f842a2cff418f82166c82ceaec328b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86C0 10952 bytes

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